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Tuesday, February 21st 2012, 9:16pm

Elicura class landing ship

In 1942 and 1943, Chile planned to lay down the third and fourth ships of the Rancagua class. However, there has been a proposal to instead build these two ships to a smaller, less expensive design.

Quoted

[SIZE=3]Elicura class, Chilean Barcaza laid down 1942[/SIZE]

Displacement:
687 t light; 717 t standard; 947 t normal; 1,132 t full load

Dimensions: Length overall / water x beam x draught
173.89 ft / 167.32 ft x 33.79 ft x 9.02 ft (normal load)
53.00 m / 51.00 m x 10.30 m x 2.75 m

Armament:
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all aft
4 - 1.10" / 27.9 mm guns (1x4 guns), 0.67lbs / 0.30kg shells, 1942 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
Weight of broadside 10 lbs / 5 kg
Shells per gun, main battery: 1,500

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,966 shp / 1,466 Kw = 16.00 kts
Range 7,350nm at 15.00 kts
Bunker at max displacement = 415 tons

Complement:
84 - 110

Cost:
£0.206 million / $0.823 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.1 %
Machinery: 51 tons, 5.4 %
Hull, fittings & equipment: 234 tons, 24.7 %
Fuel, ammunition & stores: 260 tons, 27.5 %
Miscellaneous weights: 400 tons, 42.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,561 lbs / 708 Kg = 799.3 x 1.6 " / 40 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 1.1 ft / 0.3 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
and transom stern
Block coefficient: 0.650
Length to Beam Ratio: 4.95 : 1
'Natural speed' for length: 15.43 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.67 ft / 1.12 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (15 %): 13.12 ft / 4.00 m (8.20 ft / 2.50 m aft of break)
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (20 %): 15.09 ft / 4.60 m (8.20 ft / 2.50 m before break)
- Stern: 15.09 ft / 4.60 m
- Average freeboard: 10.52 ft / 3.21 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.5 %
- Above water (accommodation/working, high = better): 84.0 %
Waterplane Area: 4,519 Square feet or 420 Square metres
Displacement factor (Displacement / loading): 185 %
Structure weight / hull surface area: 37 lbs/sq ft or 180 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.87
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped

Breakdown of Miscellaneous Weights:
- 5 tons for Suite-42b electronics
- 240 tons for up to six tanks, trucks, vehicles, or deck cargo
- 15 tons for crew comforts (HVAC, etc)
- 140 tons for vehicle crews

Electronics:
- Type 103 "Nalca" navigational surface and air search radar (1 radar, 2 tons)
- Roth-389b backup diesel generator set (3 tons)

Ships in Class:
- Elicura (proposed, 1942)
- Orompello (proposed, 1943)

2

Wednesday, February 22nd 2012, 12:23am

Interesting design. I am curious regarding the choice of a transom stern on a relatively slow design; does it result in significant savings?

3

Wednesday, February 22nd 2012, 1:25am

Hmm. I kinda forgot I set a transom, actually.

4

Wednesday, February 22nd 2012, 1:31am

Well, let's try this design. Heavier by 35 tons, and longer by almost five meters to make up for it, but I removed the transom.

Quoted

[SIZE=3]Elicura, Chilean Barcaza laid down 1942[/SIZE]

Displacement:
722 t light; 753 t standard; 1,035 t normal; 1,260 t full load

Dimensions: Length overall / water x beam x draught
189.31 ft / 182.74 ft x 33.79 ft x 9.02 ft (normal load)
57.70 m / 55.70 m x 10.30 m x 2.75 m

Armament:
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all aft
4 - 1.10" / 27.9 mm guns (1x4 guns), 0.67lbs / 0.30kg shells, 1942 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
Weight of broadside 10 lbs / 5 kg
Shells per gun, main battery: 1,500

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,422 shp / 1,807 Kw = 16.00 kts
Range 7,350nm at 15.00 kts
Bunker at max displacement = 507 tons

Complement:
90 - 118

Cost:
£0.224 million / $0.896 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.1 %
Machinery: 63 tons, 6.1 %
Hull, fittings & equipment: 257 tons, 24.9 %
Fuel, ammunition & stores: 313 tons, 30.2 %
Miscellaneous weights: 400 tons, 38.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,736 lbs / 788 Kg = 889.2 x 1.6 " / 40 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.2 ft / 0.4 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.19

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.650
Length to Beam Ratio: 5.41 : 1
'Natural speed' for length: 13.52 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.67 ft / 1.12 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (15 %): 13.12 ft / 4.00 m (8.20 ft / 2.50 m aft of break)
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (20 %): 15.09 ft / 4.60 m (8.20 ft / 2.50 m before break)
- Stern: 15.09 ft / 4.60 m
- Average freeboard: 10.52 ft / 3.21 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.7 %
- Above water (accommodation/working, high = better): 82.1 %
Waterplane Area: 4,731 Square feet or 439 Square metres
Displacement factor (Displacement / loading): 193 %
Structure weight / hull surface area: 37 lbs/sq ft or 183 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.41
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped

Breakdown of Miscellaneous Weights:
- 5 tons for Suite-42b electronics
- 240 tons for up to six tanks, trucks, vehicles, or deck cargo
- 15 tons for crew comforts (HVAC, etc)
- 140 tons for vehicle crews

Electronics:
- Type 103 "Nalca" navigational surface and air search radar (1 radar, 2 tons)
- Roth-389b backup diesel generator set (3 tons)

Ships in Class:
- Elicura (proposed, 1942)
- Orompello (proposed, 1943)

5

Thursday, February 23rd 2012, 11:44pm

Very interesting. Very useful too.

6

Thursday, February 23rd 2012, 11:44pm

Thanks.